Multiconditional if statement problem

Hi

What im trying to achieve:

I have a multiple checkboxes linked to different cells and need to do somethin dependent on the linked cells value (True, False or vbNullstring)

Private Sub CommandButton2_Click()
        
       Dim CurCell As Object
       Dim s As Integer
       Dim h As Integer
       Dim v As Integer
       Dim g As Integer
       
  
        s = Left(ComboBox1.Value, 2)
        h = Right(ComboBox1.Value, 2)
        
        v = Left(ComboBox2.Value, 2)
        g = Right(ComboBox2.Value, 2)
        
        MyHours = TimeSerial(s + v, h + g, 0)
        
       
        For Each CurCell In Range("A2:K17")
            If CurCell.Value = True And CurCell.Offset(-1, -1).Value = "" Then ' if checked and linked cell offset is empty then result
                CurCell.Offset(-1, -1).Value = ComboBox3 & ":   " & ComboBox1.Value & "-" & Format(MyHours, "hh:mm")
            ElseIf CurCell.Value = True And CurCell.Offset(-1, -1).Value > "" Then ' if checked and linked cell not empty then append result
                CurCell.Offset(-1, -1).Value = CurCell.Offset(-1, -1).Value & Chr(10) & ComboBox3 & ":   " & ComboBox1.Value & "-" & Format(MyHours, "hh:mm")
            Else
                ' do nothing
            End If
        Next
        ActiveSheet.CheckBoxes.Value = False
        
        Unload Me
    
End Sub

*Edit: The part that isn't working is the If statement

It work ok when i only have this code

        For Each CurCell In Range("A2:K17")
            If CurCell.Value = True  Then CurCell.Offset(-1, -1).Value = ComboBox3 & ":   " & ComboBox1.Value & "-" & Format(MyHours, "hh:mm")
        Next

But then i loose the append functiomality when there is allready data in curCell.Offset(-1,-1)

Hope for some good help

Steffen Thomsen